Improvement in pitman-head and wrist-pin



WILLIAM N. WHI'IELY,y OF SPRINGFIELD, OHIO.

IMPROVEMENT IN PlTMAN-HEAD AND WRIST-PIN.

Specification forming part of Letters Patent N o. 70,143, dated October22, 1867.

To all whom it may concern:

Be it known that I, WILLIAM N. WHITELY, of Springfield, in the county ofClarke and State of Ohio, have invented a new and useful l Improvementin Pitman-Heads and Wrist- Pins; and I do hereby declare the followingto be a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, in which- Figure l is a plan view, andFig. 2 a sectional view of the same.

My invention consists in an improved pitman-head and wrist-pin, by meansof which connection between the pitman and crankwheel is capable ofadjustment to take up lost motion as the friction al surfaces are wornaway by use. j

In order that others may understand the construction and operation of myinvention, I will proceed more particularly to describe it.

' W, Fig. 1, is the crank-wheel, receiving its motion from the drivingmechanism of the machine; and A is the pitman or connecting rod,provided with the solid head B, through which projects the wrist-pin C.The head B has a hole drilled in the end of its neck b, and ascrew-thread cut on its inner surface, into which the pitman A is irmlyscrewed and securely fastened by a jam-nut, J, in order to keep it frombecoming loose while the machine is in operation. The head has alsoanother hole drilled in it at right angles to the former, conical inoutline, to receive the wristpin C, which is turned to a correspondingsize and shape, so as to fit the cavity exactly. The larger end of thewrist-pin O is turned with a square shoulder, and has a cylindricalprojection on its surface to fit Within a recess in the side ofcrank-wheel, as shown in Fig. l, anda hole is drilled entirely throughits center, from end to end, for the clamping-bolt Gr, the head of whichis at the back side of the crank-wheel W, and the screw end and nut F,at the outer or projecting end of the wrist-pin, bind the same rmlyinits seat in the side of the crankwheel. The smaller end of the wrist-pinC is also cylindrical, and has a screw-thread cut to receive the nut Dand the jam-nut E, which serve to secure the head B in its place uponthe wrist-pin. The nut D is made with a recess, as represented in thesection at a a, Fig. 2, so that as the frictional surfaces may be wornaway by use, thereby permitting the wrist-pin to project farther throughthe head, this loss may be compensated, the recess permitting the nut topass up beyond the screwthread and overlap the conical portion ofthepin, and rendering the motion of the pitman at all times regular andfree from violentjerks.

This nut D is kept from becomingloose by the' motion of the machine bymeans of the jamnut E, which works upon the lower end of the wrist-pinO. i

This invention of mine is adapted to all machinery where motion iscommunicated by means of a pitman and crank, but is especially adaptedto mowing machines and harvesters,

where the motion is very rapid and violent,

and the wear must necessarily be considerable. It is very easilyadjusted as the wristpin may be worn, thereby keeping at all times theclosest contact of the different parts consistent with the freestmotion. It is not liable to get out of order, and when either head orwrist-pin becomes disabled it may be with the utmost facility replaced.

Having described myinvention, whatI claim as new, and desire to secureby Letters Patent, is-

1. The solid head B, provided with a conical box, as set forth, incombination with the tubular wrist-pin O, all constructed and operlating as set forth.

2. The recessed nut D, in combination with the wrist-pin, as and for thepurpose set forth.

WILLIAM N. WHITELY.

Witnesses Trios. J. PRINGLE, CHARLES EvANs.

